My mother has taught in this school (since she was less than thirty.)对括号部分提问 （）（）（）your mother（）in t

题目

My mother has taught in this school (since she was less than thirty.)对括号部分提问 （）（）（）your mother（）in this school?

答案

问某动作持续了多长时间,用 how long:
How long has your mother taught in this school?